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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Baseline brain activity fluctuations predict somatosensory perception in humans
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Baseline brain activity fluctuations predict somatosensory perception in humans

机译：基线脑活动波动预测人类的体感知觉

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摘要

In perceptual experiments, within-individual fluctuations in perception are observed across multiple presentations of the same stimuli, a phenomenon that remains only partially understood. Here, by means of thulium-yttrium/aluminum-garnet laser and event-related functional MRI, we tested whether variability in perception of identical stimuli relates to differences in prestimulus, baseline brain activity. Results indicate a positive relationship between conscious perception of low-intensity somatosensory stimuli and immediately preceding levels of baseline activity in medial thalamus and the lateral frontoparietal network, respectively, which are thought to relate to vigilance and "external monitoring." Conversely, there was a negative correlation between subsequent reporting of conscious perception and baseline activity in a set of regions encompassing posterior cingulate/precuneus rnand temporoparietal cortices, possibly relating to introspection and self-oriented processes. At nociceptive levels of stimulation, pain-intensity ratings positively correlated with baseline fluctuations in anterior cingulate cortex in an area known to be involved in the affective dimension of pain. These results suggest that baseline brain-activity fluctuations may profoundly modify our conscious perception of the external world.
机译：在知觉实验中，在同一刺激的多次呈现中观察到个体内部的感知波动，这种现象仅得到部分理解。在这里，通过th钇铝石榴石激光和事件相关的功能性MRI，我们测试了相同刺激感知的差异性是否与刺激，基线脑活动的差异有关。结果表明，对低强度躯体感觉刺激的有意识感知与内侧丘脑和额叶外侧外侧网中基线活动的前一个基线水平之间存在正相关关系，据认为这与警惕性和“外部监测”有关。相反，随后的意识感知报告与基线活动在包括扣带回/颞顶皮层和颞顶皮质的一组区域中呈负相关，可能与自省和自我导向过程有关。在伤害性刺激水平下，疼痛强度等级与已知扣痛区域有关的前扣带回皮层的基线波动呈正相关。这些结果表明，基线脑活动波动可能会深刻改变我们对外界的意识。

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